This is the original Dodge advertisement introducing the 440 six pack to the public.
The six pack option is denoted in the VIN by the fifth digit of "M". Lift-off cars, as they are commonly referred to, were available in both hard tops (WM23M) and coupes (WM21M). They made 1487 hard tops (661 auto and 826 4-spd) and 420 coupes (153 auto and 267 4-spd).
The option code for six pack cars (A12) consists of the following items. The A12 option replaces the 383 4bbl with a 440 3-2bbl engine, including three 2bbl carburetors on top of an Edelbrock aluminum intake. A Hemi 4-speed transmission is standard with the 727 Hemi automatic being available as an option. The drive train upgrade also includes 26-inch radiator with a 7-blade torque drive fan. Also included is the 9-3/4 Dana (410 gear ratio) rear end and four-wheel 11-inch drum brakes. Disks are not available.
A no-gloss black fiberglass hood pinned at each corner and a functional air scoop is part of the package. Because of the large breather assembly, a 3-speed wiper motor was also included. 15" x 6" JJ rims with 15-inch red-streak tires were the only tire and wheel combination available.
With the mid-year introduction of the lift-off cars came four new high-impact colors: Hemi orange (V2), bright red (R4), bright green (F6), and yellow (which was a write-in option).